Add defaults for PS1 composition

Now host/user overrides don't have to be created.

dotfiles/bash/defaults.bashrc

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+
+#
+# defaults to be overriden in host/hostname.bashrc and user/username.bashrc
+#
+
+make_ps1u() {
+    echo "";
+}
+
+make_ps1h() {
+    echo "$blue\h$normal";
+}

dotfiles/bash/head.bashrc

@@ -4,6 +4,7 @@ mkdir -p /var/tmp/bash-rv
 
 for include in \
   "${HOME}/.bash/colors.bashrc" \
+  "${HOME}/.bash/defaults.bashrc" \
   "${HOME}/.bash/main.bashrc" \
   "${HOME}/.bash/user/$(whoami).bashrc" \
   "${HOME}/.bash/host/$(hostname -s).bashrc" \